Im unaware of any covers unless you shrink wrapped your windshield.
Any chance you could just upgrade your rock guard on your RV? I've seen some really robust ones! If its one of the broom bristle rock guards then there are definitely better ones out there
2000 TJ Solar yellow, 3.73, limited slip D44
2012 GMC sierra crew cab--Daily Driver
2008 jk X 6spd Red Rock---Sold and missed